Reviewing my prior measurement of the distance from propeller aft mounting/crankshaft flange to the spinner backing plate I mounted the plate backwards. The spinner backing plate has a 5/8" flange around the circumference for mounting nut plate attaching the spinner. This flange extends 7/16" aft from the aft backing plate mounting surface; 5/8" flange - 1/16" spinner back plate thickness - 1/16" spinner backing plate doubler). The location of the cowl relative to the crankshaft mounting is as follows. 1/4" flywheel thickness, 2" from the propeller aft mounting surface to the spinner backing plate minus 7/16" lip. Set Ez Cowl jig for 1 9/16". This distance is less than the supplied spacer that I used to set the clearance distance. Replace the spacer with the four bolts and locking nuts that hold the jig to the flange. The forward bolt head surface sets the clearance distance. The 1-1/4" bolts I have on hand are barely long enough and 1-3/4" bolts on order.